Please - would you who are experts here maybe advice me about if to upgrade from my newly purchased Canon EF 300 f/2.8L IS USM to version II?

[neuroanatomist]

RE the drop in polarizer, IMO a polarizing filter really give your images pop in some situations - I think it's an essential part of a kit. For the superteles, the drop-in CPL from Canon is the only option.


So, I'd definitely recommend getting one...the problem is that there do not seem to be any available.